So basically what I'm doing is to chain multiple 'tagged=ACTUAL_TAG' together. I get a successful response but when I compare that in the "Stack Overflow search q" results,

https://stackoverflow.com/search?q=

I get varying results/responses - they're not exactly alike. Some of the questions from the "Stack Overflow search q" are not found in my URI request. That's why I'm asking if I'm doing something wrong..

EDIT:
As answered below, the /search URI request did the trick for me as it allows "OR" tags where you chain tags together.